import pygame.font
from pygame.sprite import Group
from ship import Ship



class Scoreboard:
    '''显示得分信息的类'''

    def __init__(self,ai_game):
        '''初始化显示得分涉及的属性'''
        self.ai_game=ai_game
        self.screen=ai_game.screen
        self.screen_rect=self.screen.get_rect()
        self.settings=ai_game.settings
        self.stats=ai_game.stats


        #显示得分信息时使用的字体设置
        self.text_color=(30,30,30)
        self.font=pygame.font.SysFont(None,48)

        #准备包含最高得分和当前得分的图像
        # 准备初始得分图像
        self.prep_score()
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()



    def prep_score(self):
        '''将得分转换为一幅渲染的图像'''
        rounded_score=round(self.stats.score,-1)
        score_str='{:,}'.format(rounded_score)
        
        self.score_image=self.font.render(score_str,True,
                    self.text_color,self.settings.bg_color)

        #在屏幕右上角显示得分
        self.score_rect=self.score_image.get_rect()
        self.score_rect.right=self.screen_rect.right-20
        self.score_rect.top=20

    def prep_high_score(self):
        '''将最高得分转换为渲染的图像'''
        high_score=round(self.stats.high_score,-1)
        high_score_str='{:,}'.format(high_score)
        self.high_score_image=self.font.render(high_score_str,True,self.text_color,self.settings.bg_color)
        #将最高得分放在屏幕顶部中央
        self.high_score_rect=self.high_score_image.get_rect()
        self.high_score_rect.centerx=self.screen_rect.centerx
        self.high_score_rect.top=self.score_rect.top

    def prep_level(self):
        '''将等级转换为渲染的图像'''
        level_str=str(self.stats.level)
        self.level_image=self.font.render(level_str,True,
                                          self.text_color,self.settings.bg_color)
        #将等级放在得分下方
        self.level_rect=self.level_image.get_rect()
        self.level_rect.right=self.score_rect.right
        self.level_rect.top=self.score_rect.bottom+10





    def show_score(self):
        '''在屏幕上显示等级和得分和余下的飞船数'''
        self.screen.blit(self.score_image,self.score_rect)
        self.screen.blit(self.high_score_image,self.high_score_rect)
        self.screen.blit(self.level_image,self.level_rect)
        self.ships.draw(self.screen)
    def check_high_score(self):
        '''检查是否诞生了新的最高分'''
        if self.stats.score>self.stats.high_score:
            self.stats.high_score=self.stats.score
            self.prep_high_score()

    def prep_ships(self):
        '''显示还余下多少艘飞船'''
        self.ships=Group()
        for ship_number in range(self.stats.ships_left):
            ship=Ship(self.ai_game)
            ship.rect.x=10+ship_number*ship.rect.width
            ship.rect.y=10
            self.ships.add(ship)


